Statistical Methods and Applications

, Volume 10, Issue 1–3, pp 157–174 | Cite as

A statistical model for orientation mechanism

  • Angela D'Elia
Statistical Applications


A variance components model with response variable depending on both fixed effects of explanatory variables and random components is specified to model longitudinal circular data, in order to study the directional behaviour of small animals, as insects, crustaceans, amphipods, etc. Unknown parameter estimators are obtained using a simulated maximum likelihood approach. Issues concerning log-likelihood variability and the related problems in the optimization algorithm are also addressed. The procedure is applied to the analysis of directional choices under full natural conditions ofTalitrus saltator from Castiglione della Pescaia (Italy) beaches.

Key words

Circular data directional behaviour longitudinal data simulated maximum likelihood variance components 


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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Angela D'Elia
    • 1
  1. 1.Dipartimento di Scienze StatisticheUniversità di Napoli Federico IINapoliItaly

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